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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a2d9e7d0a626f990fbc1a3247e2f6ff2756a69e1448e1978b301eedb2be06c8' 
  AND token = 'yuqgVp0TTre6LbiiM7shkVr33thij4JVKF2U7j6lizo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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