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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0d84e3ca03abde2d6d697309c2aceeb71dc1dc2e2b84f10e88db84329c482fa' 
  AND token = 'T4oj7+4txqr2C/BKJ3fCSUZ1QWE7YqEXw/Msze3mX3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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