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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bccc5e14d26e31de8935b25512f69c13c20353022530fbe560439244204728e' 
  AND token = '5RH/lQ+05K+ohTwpunFX4TqPlrETDJJpcX7beYTp880=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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