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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd88e2854f189eceee382ecdb2b7faeafb7510cd123da20acb18f97a96f713ac4' 
  AND token = '9CoXTM3OFT52j+KnYf9V9bTe6Vr8jjmxX53HAJykMHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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