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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf88876cb37285f804f00bc542f435f19b5b521dbd8ea992c81983bd84a9db3' 
  AND token = 'a2mt9FaaaMlD8aQ801/dQh21kzsbPlKyu9ancd+zw/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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