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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '880cde463502dc5e4a9148ac085578af8981ed99d4e84398916998f7633115c5' 
  AND token = 'j1fDHLoj17GcctGV3Oi+ymsbWvxHNMj8GPVpSLg3Li4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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