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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83721ec2e23777f834cac846dee335e993ff7806f299516b54c8cea9a03511ec' 
  AND token = 'Kb/rQaUXJbXtsfme4sv5Fdybv23tye5Kz3iB0N60x70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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