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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd932a2ff6e2ba4fd2c3bf722cc16eed210baa7a836d7b5bd2583807359ba650d' 
  AND token = 'Gm1+G+LC29Ro8A/ziLJsTBoFV6AOX4hW8PFUyENw8Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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