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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fa6f7118b6a57ecfc424988416d1ab0bd0d3412e3675de085723af6606345ee' 
  AND token = 'MfMGF6V/RyvcR4L94fKYjClijQNHmsS7A/3dmDunlLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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