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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e7d0adca1cc0f162c32fc99087f19480175793a0b3cb6d9d57cc20f29d89f66' 
  AND token = 'EcdKzN62HUnvQKiU8KdNbYck06Y+8RNdfVQHDcwLecs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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