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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deea14b063efb6766959e6268d9fe0c70a1a1f6a145a5de7208c6d13eb21dad8' 
  AND token = '6PLAAnU/YMZw7zzwOnmbVTtP6oVp93NH6qUlB//dXJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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