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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5452111e2dee443e5e2b589423ff895bed6ec52cfb93328ba5806208f33b7d3e' 
  AND token = 'xSFJicja7kR3sEJFXn/W4SUsAug9SQdwo2um+yihYv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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