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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c6f389f469dfa56973a82dc780bbb220cbb2478336512c0fb907c96014960b' 
  AND token = 'i+9mn6G8hpLkq73mky+MClZwASuk4UMFoNGYii9qbMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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