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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7b17d45662b8c72cb253dc66f83e4a229d0b107bcd713a067f044ef444e9339' 
  AND token = 'SfIDiIPhEkzMcufzwEdLpV2MhTWwzTQ34oGcWO57U1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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