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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '886b1dd73554db9246b810cd498367c0f474b8318542fa7bb92d13d5e660994c' 
  AND token = 'thl9v86lWfldNJkGFI+vJADC01S4t8rcz71GFwR5b/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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