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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c4e7f0cb6ec139c7ebb1bb64f04a57057746e70cd36eb743d3cce167e3864e' 
  AND token = '03FN9nYc44zzyhTT/dkvzX5AMJ95tRacTDehwEVNzdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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