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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '673f574aa1d3cdcedad8f40b40a6f1de5b580d1f4fb2dd59804379f74a6ac0c7' 
  AND token = 'nZGMzVL6ejZMyDYRBPfJbTG46lhwJ5aFoq6fDRFq3Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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