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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b292df969398ef91ffc5253946b81b188d254b8e558646ca01fd92f002220a5' 
  AND token = 'Odqdy9DX/hUYBa+vz+WSOluNpAAdw/6ElSsp7el+sIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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