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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '259481da542430193ec3ab19cc092c5586f9eea10ef38064764a39bae0fd90d5' 
  AND token = 'tPFg+663VrlbFIPDL3cuSqzfDHJb6N+LgBqguX33xSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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