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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b76dabe38b7bb3065a2324320f45b300708117cea3743308611cab443c80fba0' 
  AND token = 'HHqeNIc6WLhs/6LCpUMcubBzDJwdcxHlhUfhGC1k7UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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