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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45bc1820347d5895910edea813a3fa0405a4d6767ad9803883bf382a57f28edc' 
  AND token = '5E9ZciUsKLYlb6XzTGulj7blenms7hkgxTO1a4RlB8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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