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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8226f41b280c1280736b02cec38629c7a2cf975169edf079d483e818ec4e132' 
  AND token = 'wHVH+RzC2CCVPSaW2jdQmrDS48/PP0kLItLfeMhscC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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