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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df6c49727da3505511e7f59a75601c48a4d8ee8a82717770e1d068386f7b7774' 
  AND token = 'QsxxNftEr6mysP7TyDR0KW01W15e1F4uqc0lCrNnrag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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