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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dad079710bdd59c9b95270897ee08a94063da76f170bfc5223cf51c3c1550deb' 
  AND token = 'KcqwoRqZssvVezw2BquaFNzykA+SMWNX5fXUa0lV+5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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