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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c617657972218b3d2501d05c68be6cecfadc058bef17610a1727e2ce253da4' 
  AND token = 'uvr2kjc+qLd9kkacDqMrDX6YpA6nC2ai3HepS3sZeh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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