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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f6e1d1b4b18e74bbed42bdc8438091de42497a7d2219bdb626e7407ce5483d7' 
  AND token = 'OOScMcsVzChms+TekL5ODQ1Y59iuEx825NtkeEmtpfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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