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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa6fe99840b3755b09edcdbe37e087ce9aefd94319f25b2b3c0bfca524c324e' 
  AND token = 'QLzbJiv8b3D2aYoZ17WDBa66VyAGfOHT8gC6uy8wd90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}