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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cabec034da816e567387d77c7d5ad3ba4b4eadcd771bd8b5bbbd2fb3f8154c8' 
  AND token = 'z4KJ/k3guqjwqKeUVjXFRlNrqt9nRKzzUSY7H/DdyJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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