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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8945f4e9c8c9477ad857230a0d751d1a8aff7d732186af278494ca7e9973bdab' 
  AND token = '2dXYpg+BFl0hnfItWIOIZ/zMdc9Vzww+bYXMHwLWtaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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