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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7e0be3432d21f18c8d09da82f7d9d84dedb85c97e6e62bae3fb1b7bd5a5adaa' 
  AND token = 'HIjPH/oSyTxOLbX45JOHIJb/8HCX/UcP8Fa7z+s+8JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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