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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f16f1eef0be309faa68fabb9ac0e7d88a588de5cc652cb334cb8d54bfeec16' 
  AND token = '8QsNwQw1XihmnJkovyg/o0t/LOtCPkxdjXDiGMVv6Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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