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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84665713defd7b188d9e0a11c2de303e84602180a4d106334cd9c85af147095d' 
  AND token = '67q5uMNIsRR6U2tIdFmdsNoHxbB8EdPVc7BBWUBBh7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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