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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a64a8204424ea8f3b3a6f8d2cb1ed03b1514ec4f5e331270fa52f95849f749d7' 
  AND token = 'c481xYaU5rb/flvCJUkNDAEDv30UBmIqeZcUeCoe1rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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