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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '931075bd4335bfb062cc1a6874ce4864fde2ac2080f32017b2a0a6f5fce75277' 
  AND token = 'WI1GJtDK94T/Sj15/LH/ZADeafiBcLqL7BWgQ4aPcPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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