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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0842e68fa0df668ce81424c7deedf218770316c5d6f754dcc24248823c828b54' 
  AND token = 'BE4QQkh/sZq5qtRMBENwk68pk/nVRV4Rf6ErCEvYTJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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