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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02bbbd6b1b26ac4e67d96de83907e50c040013426954bfc20756e44d94e0252' 
  AND token = 'DS2RRzWkrtVa8EdMw/BCVeESbJVWOaszh3Oifp8I3F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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