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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cece45e82135e3989a6ebd9961190a1cb571a488e13bfb32d11704fc04e34757' 
  AND token = 'mqltkbtGBsL1BwjEZnegOPpNkfsS6oABwIlxS9s25Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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