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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f04db81d3b2f3bfd8a71acad5649738fd0f69ed4f63a3cf640677589946c41c' 
  AND token = '3+Q16ycOKFAkAT3USLUq/RhEdDnDoENZ3IdgYalV5kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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