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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '101f62c6901c206b93932df1dd6b98257259ef28817dbb253ed233fdf1ba8d06' 
  AND token = 'bV64sSlAI44nIwG0X36dp34+pvhPoQymTtL8dCMRHEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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