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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd89871eee63a3ddcafce4af899ffd1c756c5c7b222a79ca25d30910301d4cc3' 
  AND token = 'QTs4Fs1WadWedo1U0kD6Y2ne5tzYq//1/faX1FMuAVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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