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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c4298d8757dc4d4731bfdda7ab3f70e291ee9a75083d0496a52f0f34535f13' 
  AND token = 'O+PSryEsFzbZEsXYZ6ldnXiyvWgFeonWe0nuG3tW4TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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