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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ec4554b6f653d2d01ef3d58e014b423d3dd942e9620607ef47e1fc7fcaa7f18' 
  AND token = 'BkA9VI95EQUuBc3vVskSbfpMM1A0Sxze2MpVhvl0vWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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