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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed2c891c9d12d5211b6f84a3d314000a24c8467022d1bd61cea5a40655e762a5' 
  AND token = '1C97CBbJE5M/NmRryEpkGRCPB0AzeHwR8ya4jMrytcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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