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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa23ae1386d5792151582f507dac08f4449d6b7a3ac03a964a7db310f24dbde' 
  AND token = 'U0SFIujjMFhVsvULPbHRlPqP99G2okb2A0Ewgj/xoNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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