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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6a7af2b2c44457d6268ddcacea58572cb6da305c795fec5557481b9c2323032' 
  AND token = '0Fn7HSXZGCCwN6OdBoBdCJWAVT4F52aolYJUdFGW+hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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