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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89f90fc6b36520142d43a6f1b9f90cdb449d9761da8a4db12458f9944dcd2ba7' 
  AND token = 't/al1v4WugH2nkWq7rtLo/Re4l2jiVSqpqwTMVNjR38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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