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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb83e345b46cb6b1b4885c05cf73ed0a11b189141862e45b64e0f712a623e107' 
  AND token = 'SsJmrWZJxqvKWp2HnTYbcKcwA3KPiKLgeztiDGOiuF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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