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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aa24bd1bc6e4d6b65c2755f4185844268f05413199e8b4892ac6b460dc4575a' 
  AND token = '394I4GbVZ5kTZ9Ftr8krSuWov4kAKWVg31ThrfRB2AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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