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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5ff2b855fe3c573aecf20799197cc49f4c3716d0336cfa3e949f3f118a3096e' 
  AND token = 'o5cBCa8oULnYqzSoQInowaA5A0h0v3k/uHGpFG3gYDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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