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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d49ca480b532ce3a235341adae0a4c0304e6fcd12275f52591672a77f9a2544' 
  AND token = 'ZVcKEerjoR4eHNZpdgtcNREmIYIGOujmGPvAd3Jup8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00122

JSON explain

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