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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5656f5b223547b79c5886d53b9cd932c330c6a6e956d5d18177a0330790bd862' 
  AND token = 'G8uu1JiL8HuS4l/PHP/R+M2yBnGmhuQ903xrGb0krqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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