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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7b1716d496d8986766c414aabf3c9f497cab9e0a6fea595847bd9d8492a0784' 
  AND token = 'bh5wGQOTf79E6pMoWfhLW6zz48gX2ROM5ktQR3kcm7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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