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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b0765de3cae8ecc3808a3ae66de1371b03e42c02b75fbbe7ca8e3088959c920' 
  AND token = 'ewpC231LjD0T+c06AoaHjyx5lCOTT2lDseflEjrd02I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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